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09 Cayenne 5504 Fault Code

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Yes it was 5504 but it showed up under the engine section on Durametrics. I reset it and will see. If it is a lid/trunk or door problem I am not worried about it. I was concerned because of the thermostat changeout.

As always thanks for your help. :cheers:

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The check engine light came on again and durametrics showed fault code 5504 again, no signal/communications. Module identification is "Siemens Digital Motor Electronics SDI4". I drove the Cayenne for a week after I reset the fault code before the light came on. Can you provide any guidance where the hood latch switch is located? Maybe something got loose or moved when I leaned in working on the thermostat.

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P0455 Evaporative Emission System Leak Detected (large leak)

Possible cause of fault

- Tank cap not tightened correctly, faulty or missing

- Mechanical fault in EVAP canister purge valve (does not close fully)

- Leakage diagnosis pump leaking internally (membrane) or externally

- Mechanical fault in EVAP canister shutoff valve (does not close fully when power is supplied)

- EVAP canister shutoff valve connections leaking

- Tank system (including pipes) leaking

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